Assystem is an international company with one mission: accelerate the energy transition around the world.

Every day, our 6,500 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy.

We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition.

Drawing on more than 55 years’ experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimize the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked second in the world for nuclear engineering.

To ensure a viable, efficient, and reliable energy future for all.

Job Description

Mechanical Engineer

Warrington / West Lakes

Staff / Contractor

The nuclear industry is expected to need possibly 100,000 new employees over the next decade. Nuclear in the UK, is seeing a recent renaissance with the UK government pledging its support for both large and small-scale nuclear energy projects.

Assystem is the second largest Nuclear Engineering organisation and provides technical engineering support across the world, supporting complex Nuclear New Build, Decommissioning and Defence programmes.

We are currently looking for a Mechanical Engineer to join our expanding team in either our West Lakes or Warrington offices.

This role will involve developing mechanical design solutions in response to problem definitions from the OU system engineering community dealing with plant failures and potential improvements.

The problems that are likely to occur will be varied for plant, pipework and equipment on several plants dealing with High Active, Medium Active and Low Active waste streams that process, compact, encapsulate, vitrify or package waste.

The equipment or machinery could be used within a shielded cell being bespoke and designed for remote handling or remote operation in hazardous areas, or out cell where the equipment is more likely to be of a conventional nature for mechanical handling material in man accessible areas. The pipework could be located within buildings or externally providing services to and from buildings.

Additional information


  • Degree in relevant engineering discipline with design delivery experience
  • A sound engineering background with knowledge of general mechanical design aspects such as material selection, tolerancing, surface finishes, and welding
  • Previous experience involving the design of mechanical / electrical machinery
  • Competent and proven design engineer, capable of producing designs, schemes, drawings, and supporting calculations who is familiar with the roles and application of the CDM regulations.
  • Proficient in use of AutoCAD, and Inventor


Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.

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